Co-Channel Interference Suppression via Non-Serving Cell Data
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Solution Overview
Problem
In LTE communications systems, user terminals (UEs) face poor demodulation performance due to co-channel interference from non-serving cells, which affects the reception of downlink shared channels (PDSCH).
Innovation Solution
The method involves obtaining interference information from non-serving cells, including generation parameters, and sending this information to user terminals (UEs) to determine user-terminal-specific reference signal sequences. This information includes physical cell identifiers, antenna ports, and physical resource block bundling details, allowing UEs to perform channel estimation and suppress or cancel co-channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses only MMSE algorithm for demodulation without interference suppression, then the device complexity is low, but the demodulation performance deteriorates due to co-channel interference from non-serving cells
Solution Approach 1:
The network side performs preliminary actions by obtaining interference information from non-serving cells and sending it to the UE before the UE performs demodulation. This allows the UE to have advance knowledge of interference characteristics (such as reference signal sequences, resource allocations, and channel states) from non-serving cells, enabling more effective interference suppression during demodulation without requiring complex real-time interference measurement and analysis capabilities at the UE side.
2Reliability
If the UE performs interference suppression or cancellation processing, then the demodulation performance improves, but the loss of time increases due to additional processing steps
Solution Approach 1:
The network side obtains interference information from non-serving cells and sends it to the UE in advance before the UE performs demodulation. This preliminary provision of interference information (including reference signal sequences, resource allocations, and channel states) reduces the time the UE needs to spend on interference analysis and suppression during the actual demodulation process, as the UE can directly use the provided information rather than measuring and analyzing interference in real-time.
3Reliability
If the network side provides detailed interference information to the UE, then the UE can effectively suppress interference, but the loss of information transmission increases due to additional signaling overhead
Solution Approach 1:
The network side extracts and sends only the most critical interference information elements to the UE, rather than transmitting complete interference data. The interference information includes essential elements such as reference signal sequence identification, resource allocation patterns, and channel state indicators from non-serving cells. This selective extraction provides sufficient information for effective interference suppression while minimizing signaling overhead and avoiding transmission of redundant data.
Data Source
AI summary
Embodiments provide a method, an apparatus, and a system for handling co-channel cell interference, a base station and a user terminal. The method includes obtaining interference information of a non-serving cell; and sending the obtained interference information of the non-serving cell to a user terminal UE. Co-channel interference caused in the non-serving cell to the UE can be well suppressed or cancelled, and performance of the UE in demodulating a PDSCH can be better improved.